How do you locate the first X in a string variable named txt?

What value is returned when a Confirm box is cancelled?

What does the following line of code do?

Which statement is True for Behavioral design patterns?

Correct way to create an Object

A closure is a function defined inside another and has access to the variable which is declared and defined in parent function scope?

A javascript variable prefixed with a $ is:

function b(x, y, a) { arguments[2] = 10; alert(a); } b(1, 2, 3); What is alerted?

Right way to combine two arrays into a new array? var a = ['a', 'b', 'c']; var b = ['d', 'e', 'f'];

What's the output? if ('foo') { console.log('foo' === false); console.log('foo' === true); }

Difference between using call() and apply() to invoke a function with multiple arguments?